With few exceptions (Repetitive PO's, for example), payments to vendors require what’s called a 3-way match:

1. PO amount (branch requesting goods or services from a supplier)
2. Receipt amount (branch basically confirming they received “this many” of the goods or services)
3. Invoice amount (supplier basically saying they delivered “this many” of the goods or services)

To most efficiently process payments to vendors, invoices should bypass the branches and be sent directly to AP. If AP keys the invoice amount, and the receipt amount does not match, then the invoice will go on hold and the PO creator will be notified.